1 /* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_TYPEARRAYOOP_HPP 26 #define SHARE_VM_OOPS_TYPEARRAYOOP_HPP 27 28 #include "oops/arrayOop.hpp" 29 #include "oops/typeArrayKlass.hpp" 30 #include "runtime/orderAccess.inline.hpp" 31 32 // A typeArrayOop is an array containing basic types (non oop elements). 33 // It is used for arrays of {characters, singles, doubles, bytes, shorts, integers, longs} 34 #include <limits.h> 35 36 class typeArrayOopDesc : public arrayOopDesc { 37 protected: 38 jchar* char_base() const { return (jchar*) base(T_CHAR); } 39 jboolean* bool_base() const { return (jboolean*)base(T_BOOLEAN); } 40 jbyte* byte_base() const { return (jbyte*) base(T_BYTE); } 41 jint* int_base() const { return (jint*) base(T_INT); } 42 jlong* long_base() const { return (jlong*) base(T_LONG); } 43 jshort* short_base() const { return (jshort*) base(T_SHORT); } 44 jfloat* float_base() const { return (jfloat*) base(T_FLOAT); } 45 jdouble* double_base() const { return (jdouble*) base(T_DOUBLE); } 46 47 friend class TypeArrayKlass; 48 49 public: 50 jbyte* byte_at_addr(int which) const { 51 assert(is_within_bounds(which), "index %d out of bounds %d", which, length()); 52 return &byte_base()[which]; 53 } 54 55 jboolean* bool_at_addr(int which) const { 56 assert(is_within_bounds(which), "index %d out of bounds %d", which, length()); 57 return &bool_base()[which]; 58 } 59 60 jchar* char_at_addr(int which) const { 61 assert(is_within_bounds(which), "index %d out of bounds %d", which, length()); 62 return &char_base()[which]; 63 } 64 65 jint* int_at_addr(int which) const { 66 assert(is_within_bounds(which), "index %d out of bounds %d", which, length()); 67 return &int_base()[which]; 68 } 69 70 jshort* short_at_addr(int which) const { 71 assert(is_within_bounds(which), "index %d out of bounds %d", which, length()); 72 return &short_base()[which]; 73 } 74 75 jushort* ushort_at_addr(int which) const { // for field descriptor arrays 76 assert(is_within_bounds(which), "index %d out of bounds %d", which, length()); 77 return (jushort*) &short_base()[which]; 78 } 79 80 jlong* long_at_addr(int which) const { 81 assert(is_within_bounds(which), "index %d out of bounds %d", which, length()); 82 return &long_base()[which]; 83 } 84 85 jfloat* float_at_addr(int which) const { 86 assert(is_within_bounds(which), "index %d out of bounds %d", which, length()); 87 return &float_base()[which]; 88 } 89 90 jdouble* double_at_addr(int which) const { 91 assert(is_within_bounds(which), "index %d out of bounds %d", which, length()); 92 return &double_base()[which]; 93 } 94 95 jbyte byte_at(int which) const { return *byte_at_addr(which); } 96 void byte_at_put(int which, jbyte contents) { *byte_at_addr(which) = contents; } 97 98 jboolean bool_at(int which) const { return *bool_at_addr(which); } 99 void bool_at_put(int which, jboolean contents) { *bool_at_addr(which) = contents; } 100 101 jchar char_at(int which) const { return *char_at_addr(which); } 102 void char_at_put(int which, jchar contents) { *char_at_addr(which) = contents; } 103 104 jint int_at(int which) const { return *int_at_addr(which); } 105 void int_at_put(int which, jint contents) { *int_at_addr(which) = contents; } 106 107 jshort short_at(int which) const { return *short_at_addr(which); } 108 void short_at_put(int which, jshort contents) { *short_at_addr(which) = contents; } 109 110 jushort ushort_at(int which) const { return *ushort_at_addr(which); } 111 void ushort_at_put(int which, jushort contents) { *ushort_at_addr(which) = contents; } 112 113 jlong long_at(int which) const { return *long_at_addr(which); } 114 void long_at_put(int which, jlong contents) { *long_at_addr(which) = contents; } 115 116 jfloat float_at(int which) const { return *float_at_addr(which); } 117 void float_at_put(int which, jfloat contents) { *float_at_addr(which) = contents; } 118 119 jdouble double_at(int which) const { return *double_at_addr(which); } 120 void double_at_put(int which, jdouble contents) { *double_at_addr(which) = contents; } 121 122 jbyte byte_at_acquire(int which) const { return OrderAccess::load_acquire(byte_at_addr(which)); } 123 void release_byte_at_put(int which, jbyte contents) { OrderAccess::release_store(byte_at_addr(which), contents); } 124 125 // Java thinks metadata arrays are just arrays of either long or int, since 126 // there doesn't seem to be T_ADDRESS, so this is a bit of unfortunate 127 // casting 128 #ifdef _LP64 129 Metadata* metadata_at(int which) const { 130 return (Metadata*)*long_at_addr(which); } 131 void metadata_at_put(int which, Metadata* contents) { 132 *long_at_addr(which) = (long)contents; 133 } 134 #else 135 Metadata* metadata_at(int which) const { 136 return (Metadata*)*int_at_addr(which); } 137 void metadata_at_put(int which, Metadata* contents) { 138 *int_at_addr(which) = (int)contents; 139 } 140 #endif // _LP64 141 142 // Sizing 143 144 // Returns the number of words necessary to hold an array of "len" 145 // elements each of the given "byte_size". 146 private: 147 static int object_size(int lh, int length) { 148 int instance_header_size = Klass::layout_helper_header_size(lh); 149 int element_shift = Klass::layout_helper_log2_element_size(lh); 150 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh)); 151 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow"); 152 153 julong size_in_bytes = (juint)length; 154 size_in_bytes <<= element_shift; 155 size_in_bytes += instance_header_size; 156 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize); 157 assert(size_in_words <= (julong)max_jint, "no overflow"); 158 159 return align_object_size((intptr_t)size_in_words); 160 } 161 162 public: 163 int object_size() { 164 TypeArrayKlass* tk = TypeArrayKlass::cast(klass()); 165 return object_size(tk->layout_helper(), length()); 166 } 167 }; 168 169 #endif // SHARE_VM_OOPS_TYPEARRAYOOP_HPP